drivers/gpu/drm/i915/intel_lspcon.c

   1 /*
   2  * Copyright © 2016 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  *
  24  */
  25 #include <drm/drm_edid.h>
  26 #include <drm/drm_atomic_helper.h>
  27 #include <drm/drm_dp_dual_mode_helper.h>
  28 #include "intel_drv.h"
  29
  30 /* LSPCON OUI Vendor ID(signatures) */
  31 #define LSPCON_VENDOR_PARADE_OUI 0x001CF8
  32 #define LSPCON_VENDOR_MCA_OUI 0x0060AD
  33
  34 /* AUX addresses to write MCA AVI IF */
  35 #define LSPCON_MCA_AVI_IF_WRITE_OFFSET 0x5C0
  36 #define LSPCON_MCA_AVI_IF_CTRL 0x5DF
  37 #define  LSPCON_MCA_AVI_IF_KICKOFF (1 << 0)
  38 #define  LSPCON_MCA_AVI_IF_HANDLED (1 << 1)
  39
  40 /* AUX addresses to write Parade AVI IF */
  41 #define LSPCON_PARADE_AVI_IF_WRITE_OFFSET 0x516
  42 #define LSPCON_PARADE_AVI_IF_CTRL 0x51E
  43 #define  LSPCON_PARADE_AVI_IF_KICKOFF (1 << 7)
  44 #define LSPCON_PARADE_AVI_IF_DATA_SIZE 32
  45
  46 static struct intel_dp *lspcon_to_intel_dp(struct intel_lspcon *lspcon)
  47 {
  48         struct intel_digital_port *dig_port =
  49                 container_of(lspcon, struct intel_digital_port, lspcon);
  50
  51         return &dig_port->dp;
  52 }
  53
  54 static const char *lspcon_mode_name(enum drm_lspcon_mode mode)
  55 {
  56         switch (mode) {
  57         case DRM_LSPCON_MODE_PCON:
  58                 return "PCON";
  59         case DRM_LSPCON_MODE_LS:
  60                 return "LS";
  61         case DRM_LSPCON_MODE_INVALID:
  62                 return "INVALID";
  63         default:
  64                 MISSING_CASE(mode);
  65                 return "INVALID";
  66         }
  67 }
  68
  69 static bool lspcon_detect_vendor(struct intel_lspcon *lspcon)
  70 {
  71         struct intel_dp *dp = lspcon_to_intel_dp(lspcon);
  72         struct drm_dp_dpcd_ident *ident;
  73         u32 vendor_oui;
  74
  75         if (drm_dp_read_desc(&dp->aux, &dp->desc, drm_dp_is_branch(dp->dpcd))) {
  76                 DRM_ERROR("Can't read description\n");
  77                 return false;
  78         }
  79
  80         ident = &dp->desc.ident;
  81         vendor_oui = (ident->oui[0] << 16) | (ident->oui[1] << 8) |
  82                       ident->oui[2];
  83
  84         switch (vendor_oui) {
  85         case LSPCON_VENDOR_MCA_OUI:
  86                 lspcon->vendor = LSPCON_VENDOR_MCA;
  87                 DRM_DEBUG_KMS("Vendor: Mega Chips\n");
  88                 break;
  89
  90         case LSPCON_VENDOR_PARADE_OUI:
  91                 lspcon->vendor = LSPCON_VENDOR_PARADE;
  92                 DRM_DEBUG_KMS("Vendor: Parade Tech\n");
  93                 break;
  94
  95         default:
  96                 DRM_ERROR("Invalid/Unknown vendor OUI\n");
  97                 return false;
  98         }
  99
 100         return true;
 101 }
 102
 103 static enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon)
 104 {
 105         enum drm_lspcon_mode current_mode;
 106         struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
 107
 108         if (drm_lspcon_get_mode(adapter, &current_mode)) {
 109                 DRM_DEBUG_KMS("Error reading LSPCON mode\n");
 110                 return DRM_LSPCON_MODE_INVALID;
 111         }
 112         return current_mode;
 113 }
 114
 115 static enum drm_lspcon_mode lspcon_wait_mode(struct intel_lspcon *lspcon,
 116                                              enum drm_lspcon_mode mode)
 117 {
 118         enum drm_lspcon_mode current_mode;
 119
 120         current_mode = lspcon_get_current_mode(lspcon);
 121         if (current_mode == mode)
 122                 goto out;
 123
 124         DRM_DEBUG_KMS("Waiting for LSPCON mode %s to settle\n",
 125                       lspcon_mode_name(mode));
 126
 127         wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode, 400);
 128         if (current_mode != mode)
 129                 DRM_ERROR("LSPCON mode hasn't settled\n");
 130
 131 out:
 132         DRM_DEBUG_KMS("Current LSPCON mode %s\n",
 133                       lspcon_mode_name(current_mode));
 134
 135         return current_mode;
 136 }
 137
 138 static int lspcon_change_mode(struct intel_lspcon *lspcon,
 139                               enum drm_lspcon_mode mode)
 140 {
 141         int err;
 142         enum drm_lspcon_mode current_mode;
 143         struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
 144
 145         err = drm_lspcon_get_mode(adapter, &current_mode);
 146         if (err) {
 147                 DRM_ERROR("Error reading LSPCON mode\n");
 148                 return err;
 149         }
 150
 151         if (current_mode == mode) {
 152                 DRM_DEBUG_KMS("Current mode = desired LSPCON mode\n");
 153                 return 0;
 154         }
 155
 156         err = drm_lspcon_set_mode(adapter, mode);
 157         if (err < 0) {
 158                 DRM_ERROR("LSPCON mode change failed\n");
 159                 return err;
 160         }
 161
 162         lspcon->mode = mode;
 163         DRM_DEBUG_KMS("LSPCON mode changed done\n");
 164         return 0;
 165 }
 166
 167 static bool lspcon_wake_native_aux_ch(struct intel_lspcon *lspcon)
 168 {
 169         u8 rev;
 170
 171         if (drm_dp_dpcd_readb(&lspcon_to_intel_dp(lspcon)->aux, DP_DPCD_REV,
 172                               &rev) != 1) {
 173                 DRM_DEBUG_KMS("Native AUX CH down\n");
 174                 return false;
 175         }
 176
 177         DRM_DEBUG_KMS("Native AUX CH up, DPCD version: %d.%d\n",
 178                       rev >> 4, rev & 0xf);
 179
 180         return true;
 181 }
 182
 183 void lspcon_ycbcr420_config(struct drm_connector *connector,
 184                             struct intel_crtc_state *crtc_state)
 185 {
 186         const struct drm_display_info *info = &connector->display_info;
 187         const struct drm_display_mode *adjusted_mode =
 188                                         &crtc_state->base.adjusted_mode;
 189
 190         if (drm_mode_is_420_only(info, adjusted_mode) &&
 191             connector->ycbcr_420_allowed) {
 192                 crtc_state->port_clock /= 2;
 193                 crtc_state->output_format = INTEL_OUTPUT_FORMAT_YCBCR444;
 194                 crtc_state->lspcon_downsampling = true;
 195         }
 196 }
 197
 198 static bool lspcon_probe(struct intel_lspcon *lspcon)
 199 {
 200         int retry;
 201         enum drm_dp_dual_mode_type adaptor_type;
 202         struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
 203         enum drm_lspcon_mode expected_mode;
 204
 205         expected_mode = lspcon_wake_native_aux_ch(lspcon) ?
 206                         DRM_LSPCON_MODE_PCON : DRM_LSPCON_MODE_LS;
 207
 208         /* Lets probe the adaptor and check its type */
 209         for (retry = 0; retry < 6; retry++) {
 210                 if (retry)
 211                         usleep_range(500, 1000);
 212
 213                 adaptor_type = drm_dp_dual_mode_detect(adapter);
 214                 if (adaptor_type == DRM_DP_DUAL_MODE_LSPCON)
 215                         break;
 216         }
 217
 218         if (adaptor_type != DRM_DP_DUAL_MODE_LSPCON) {
 219                 DRM_DEBUG_KMS("No LSPCON detected, found %s\n",
 220                                drm_dp_get_dual_mode_type_name(adaptor_type));
 221                 return false;
 222         }
 223
 224         /* Yay ... got a LSPCON device */
 225         DRM_DEBUG_KMS("LSPCON detected\n");
 226         lspcon->mode = lspcon_wait_mode(lspcon, expected_mode);
 227
 228         /*
 229          * In the SW state machine, lets Put LSPCON in PCON mode only.
 230          * In this way, it will work with both HDMI 1.4 sinks as well as HDMI
 231          * 2.0 sinks.
 232          */
 233         if (lspcon->mode != DRM_LSPCON_MODE_PCON) {
 234                 if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON) < 0) {
 235                         DRM_ERROR("LSPCON mode change to PCON failed\n");
 236                         return false;
 237                 }
 238         }
 239         return true;
 240 }
 241
 242 static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon)
 243 {
 244         struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
 245         struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 246         unsigned long start = jiffies;
 247
 248         while (1) {
 249                 if (intel_digital_port_connected(&dig_port->base)) {
 250                         DRM_DEBUG_KMS("LSPCON recovering in PCON mode after %u ms\n",
 251                                       jiffies_to_msecs(jiffies - start));
 252                         return;
 253                 }
 254
 255                 if (time_after(jiffies, start + msecs_to_jiffies(1000)))
 256                         break;
 257
 258                 usleep_range(10000, 15000);
 259         }
 260
 261         DRM_DEBUG_KMS("LSPCON DP descriptor mismatch after resume\n");
 262 }
 263
 264 static bool lspcon_parade_fw_ready(struct drm_dp_aux *aux)
 265 {
 266         u8 avi_if_ctrl;
 267         u8 retry;
 268         ssize_t ret;
 269
 270         /* Check if LSPCON FW is ready for data */
 271         for (retry = 0; retry < 5; retry++) {
 272                 if (retry)
 273                         usleep_range(200, 300);
 274
 275                 ret = drm_dp_dpcd_read(aux, LSPCON_PARADE_AVI_IF_CTRL,
 276                                        &avi_if_ctrl, 1);
 277                 if (ret < 0) {
 278                         DRM_ERROR("Failed to read AVI IF control\n");
 279                         return false;
 280                 }
 281
 282                 if ((avi_if_ctrl & LSPCON_PARADE_AVI_IF_KICKOFF) == 0)
 283                         return true;
 284         }
 285
 286         DRM_ERROR("Parade FW not ready to accept AVI IF\n");
 287         return false;
 288 }
 289
 290 static bool _lspcon_parade_write_infoframe_blocks(struct drm_dp_aux *aux,
 291                                                   uint8_t *avi_buf)
 292 {
 293         u8 avi_if_ctrl;
 294         u8 block_count = 0;
 295         u8 *data;
 296         uint16_t reg;
 297         ssize_t ret;
 298
 299         while (block_count < 4) {
 300                 if (!lspcon_parade_fw_ready(aux)) {
 301                         DRM_DEBUG_KMS("LSPCON FW not ready, block %d\n",
 302                                       block_count);
 303                         return false;
 304                 }
 305
 306                 reg = LSPCON_PARADE_AVI_IF_WRITE_OFFSET;
 307                 data = avi_buf + block_count * 8;
 308                 ret = drm_dp_dpcd_write(aux, reg, data, 8);
 309                 if (ret < 0) {
 310                         DRM_ERROR("Failed to write AVI IF block %d\n",
 311                                   block_count);
 312                         return false;
 313                 }
 314
 315                 /*
 316                  * Once a block of data is written, we have to inform the FW
 317                  * about this by writing into avi infoframe control register:
 318                  * - set the kickoff bit[7] to 1
 319                  * - write the block no. to bits[1:0]
 320                  */
 321                 reg = LSPCON_PARADE_AVI_IF_CTRL;
 322                 avi_if_ctrl = LSPCON_PARADE_AVI_IF_KICKOFF | block_count;
 323                 ret = drm_dp_dpcd_write(aux, reg, &avi_if_ctrl, 1);
 324                 if (ret < 0) {
 325                         DRM_ERROR("Failed to update (0x%x), block %d\n",
 326                                   reg, block_count);
 327                         return false;
 328                 }
 329
 330                 block_count++;
 331         }
 332
 333         DRM_DEBUG_KMS("Wrote AVI IF blocks successfully\n");
 334         return true;
 335 }
 336
 337 static bool _lspcon_write_avi_infoframe_parade(struct drm_dp_aux *aux,
 338                                                const uint8_t *frame,
 339                                                ssize_t len)
 340 {
 341         uint8_t avi_if[LSPCON_PARADE_AVI_IF_DATA_SIZE] = {1, };
 342
 343         /*
 344          * Parade's frames contains 32 bytes of data, divided
 345          * into 4 frames:
 346          *      Token byte (first byte of first frame, must be non-zero)
 347          *      HB0 to HB2       from AVI IF (3 bytes header)
 348          *      PB0 to PB27 from AVI IF (28 bytes data)
 349          * So it should look like this
 350          *      first block: | <token> <HB0-HB2> <DB0-DB3> |
 351          *      next 3 blocks: |<DB4-DB11>|<DB12-DB19>|<DB20-DB28>|
 352          */
 353
 354         if (len > LSPCON_PARADE_AVI_IF_DATA_SIZE - 1) {
 355                 DRM_ERROR("Invalid length of infoframes\n");
 356                 return false;
 357         }
 358
 359         memcpy(&avi_if[1], frame, len);
 360
 361         if (!_lspcon_parade_write_infoframe_blocks(aux, avi_if)) {
 362                 DRM_DEBUG_KMS("Failed to write infoframe blocks\n");
 363                 return false;
 364         }
 365
 366         return true;
 367 }
 368
 369 static bool _lspcon_write_avi_infoframe_mca(struct drm_dp_aux *aux,
 370                                             const uint8_t *buffer, ssize_t len)
 371 {
 372         int ret;
 373         uint32_t val = 0;
 374         uint32_t retry;
 375         uint16_t reg;
 376         const uint8_t *data = buffer;
 377
 378         reg = LSPCON_MCA_AVI_IF_WRITE_OFFSET;
 379         while (val < len) {
 380                 /* DPCD write for AVI IF can fail on a slow FW day, so retry */
 381                 for (retry = 0; retry < 5; retry++) {
 382                         ret = drm_dp_dpcd_write(aux, reg, (void *)data, 1);
 383                         if (ret == 1) {
 384                                 break;
 385                         } else if (retry < 4) {
 386                                 mdelay(50);
 387                                 continue;
 388                         } else {
 389                                 DRM_ERROR("DPCD write failed at:0x%x\n", reg);
 390                                 return false;
 391                         }
 392                 }
 393                 val++; reg++; data++;
 394         }
 395
 396         val = 0;
 397         reg = LSPCON_MCA_AVI_IF_CTRL;
 398         ret = drm_dp_dpcd_read(aux, reg, &val, 1);
 399         if (ret < 0) {
 400                 DRM_ERROR("DPCD read failed, address 0x%x\n", reg);
 401                 return false;
 402         }
 403
 404         /* Indicate LSPCON chip about infoframe, clear bit 1 and set bit 0 */
 405         val &= ~LSPCON_MCA_AVI_IF_HANDLED;
 406         val |= LSPCON_MCA_AVI_IF_KICKOFF;
 407
 408         ret = drm_dp_dpcd_write(aux, reg, &val, 1);
 409         if (ret < 0) {
 410                 DRM_ERROR("DPCD read failed, address 0x%x\n", reg);
 411                 return false;
 412         }
 413
 414         val = 0;
 415         ret = drm_dp_dpcd_read(aux, reg, &val, 1);
 416         if (ret < 0) {
 417                 DRM_ERROR("DPCD read failed, address 0x%x\n", reg);
 418                 return false;
 419         }
 420
 421         if (val == LSPCON_MCA_AVI_IF_HANDLED)
 422                 DRM_DEBUG_KMS("AVI IF handled by FW\n");
 423
 424         return true;
 425 }
 426
 427 void lspcon_write_infoframe(struct intel_encoder *encoder,
 428                             const struct intel_crtc_state *crtc_state,
 429                             unsigned int type,
 430                             const void *frame, ssize_t len)
 431 {
 432         bool ret;
 433         struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 434         struct intel_lspcon *lspcon = enc_to_intel_lspcon(&encoder->base);
 435
 436         /* LSPCON only needs AVI IF */
 437         if (type != HDMI_INFOFRAME_TYPE_AVI)
 438                 return;
 439
 440         if (lspcon->vendor == LSPCON_VENDOR_MCA)
 441                 ret = _lspcon_write_avi_infoframe_mca(&intel_dp->aux,
 442                                                       frame, len);
 443         else
 444                 ret = _lspcon_write_avi_infoframe_parade(&intel_dp->aux,
 445                                                          frame, len);
 446
 447         if (!ret) {
 448                 DRM_ERROR("Failed to write AVI infoframes\n");
 449                 return;
 450         }
 451
 452         DRM_DEBUG_DRIVER("AVI infoframes updated successfully\n");
 453 }
 454
 455 void lspcon_set_infoframes(struct intel_encoder *encoder,
 456                            bool enable,
 457                            const struct intel_crtc_state *crtc_state,
 458                            const struct drm_connector_state *conn_state)
 459 {
 460         ssize_t ret;
 461         union hdmi_infoframe frame;
 462         uint8_t buf[VIDEO_DIP_DATA_SIZE];
 463         struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
 464         struct intel_lspcon *lspcon = &dig_port->lspcon;
 465         struct intel_dp *intel_dp = &dig_port->dp;
 466         struct drm_connector *connector = &intel_dp->attached_connector->base;
 467         const struct drm_display_mode *mode = &crtc_state->base.adjusted_mode;
 468         bool is_hdmi2_sink = connector->display_info.hdmi.scdc.supported;
 469
 470         if (!lspcon->active) {
 471                 DRM_ERROR("Writing infoframes while LSPCON disabled ?\n");
 472                 return;
 473         }
 474
 475         ret = drm_hdmi_avi_infoframe_from_display_mode(&frame.avi,
 476                                                        mode, is_hdmi2_sink);
 477         if (ret < 0) {
 478                 DRM_ERROR("couldn't fill AVI infoframe\n");
 479                 return;
 480         }
 481
 482         if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444) {
 483                 if (crtc_state->lspcon_downsampling)
 484                         frame.avi.colorspace = HDMI_COLORSPACE_YUV420;
 485                 else
 486                         frame.avi.colorspace = HDMI_COLORSPACE_YUV444;
 487         } else {
 488                 frame.avi.colorspace = HDMI_COLORSPACE_RGB;
 489         }
 490
 491         drm_hdmi_avi_infoframe_quant_range(&frame.avi, mode,
 492                                            crtc_state->limited_color_range ?
 493                                            HDMI_QUANTIZATION_RANGE_LIMITED :
 494                                            HDMI_QUANTIZATION_RANGE_FULL,
 495                                            false, is_hdmi2_sink);
 496
 497         ret = hdmi_infoframe_pack(&frame, buf, sizeof(buf));
 498         if (ret < 0) {
 499                 DRM_ERROR("Failed to pack AVI IF\n");
 500                 return;
 501         }
 502
 503         dig_port->write_infoframe(encoder, crtc_state, HDMI_INFOFRAME_TYPE_AVI,
 504                                   buf, ret);
 505 }
 506
 507 bool lspcon_infoframe_enabled(struct intel_encoder *encoder,
 508                               const struct intel_crtc_state *pipe_config)
 509 {
 510         return enc_to_intel_lspcon(&encoder->base)->active;
 511 }
 512
 513 void lspcon_resume(struct intel_lspcon *lspcon)
 514 {
 515         enum drm_lspcon_mode expected_mode;
 516
 517         if (lspcon_wake_native_aux_ch(lspcon)) {
 518                 expected_mode = DRM_LSPCON_MODE_PCON;
 519                 lspcon_resume_in_pcon_wa(lspcon);
 520         } else {
 521                 expected_mode = DRM_LSPCON_MODE_LS;
 522         }
 523
 524         if (lspcon_wait_mode(lspcon, expected_mode) == DRM_LSPCON_MODE_PCON)
 525                 return;
 526
 527         if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON))
 528                 DRM_ERROR("LSPCON resume failed\n");
 529         else
 530                 DRM_DEBUG_KMS("LSPCON resume success\n");
 531 }
 532
 533 void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon)
 534 {
 535         lspcon_wait_mode(lspcon, DRM_LSPCON_MODE_PCON);
 536 }
 537
 538 bool lspcon_init(struct intel_digital_port *intel_dig_port)
 539 {
 540         struct intel_dp *dp = &intel_dig_port->dp;
 541         struct intel_lspcon *lspcon = &intel_dig_port->lspcon;
 542         struct drm_device *dev = intel_dig_port->base.base.dev;
 543         struct drm_i915_private *dev_priv = to_i915(dev);
 544         struct drm_connector *connector = &dp->attached_connector->base;
 545
 546         if (!HAS_LSPCON(dev_priv)) {
 547                 DRM_ERROR("LSPCON is not supported on this platform\n");
 548                 return false;
 549         }
 550
 551         lspcon->active = false;
 552         lspcon->mode = DRM_LSPCON_MODE_INVALID;
 553
 554         if (!lspcon_probe(lspcon)) {
 555                 DRM_ERROR("Failed to probe lspcon\n");
 556                 return false;
 557         }
 558
 559         if (!intel_dp_read_dpcd(dp)) {
 560                 DRM_ERROR("LSPCON DPCD read failed\n");
 561                 return false;
 562         }
 563
 564         if (!lspcon_detect_vendor(lspcon)) {
 565                 DRM_ERROR("LSPCON vendor detection failed\n");
 566                 return false;
 567         }
 568
 569         connector->ycbcr_420_allowed = true;
 570         lspcon->active = true;
 571         DRM_DEBUG_KMS("Success: LSPCON init\n");
 572         return true;
 573 }